Detailed spectroscopy of 195Bi

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


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Publikationens författare: A. Herzáň, S. Juutinen, K. Auranen, T. Grahn, P. T. Greenlees, K. Hauschild, U. Jakobsson, R. Julin, S. Ketelhut, M. Leino, A. Lopez-Martens, T. Lönnroth, P. Nieminen, M. Nyman, J. Partanen, P. Peura, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Sarén, C. Scholey, J. M. K. Slotte, J. Sorri, S. Stolze, and J. Uusitalo
Förläggare: American Physical Society
Publiceringsår: 2017
Tidskrift: Physical Review C - Nuclear Physics
Tidskriftsakronym: Phys. Rev. C
Volym: 96
Nummer: 1


Abstrakt

An experiment focused on the study of shape coexistence and new high-spin structures in 195Bi
has been performed. The nucleus is in a transitional region of the
bismuth isotope chain. A large number of new states have been found,
resulting in a significant extension of the previously known level
scheme. Several new collective structures have been identified. A
strongly coupled rotational band built upon the 13/2+ isomeric state was extended up to Iπ=(49/2+) and an energy of 5706 keV. The Iπ=31/2+ member of the πi13/2 band was also found to feed a new long-lived isomeric state with an excitation energy of 2616 keV and a spin and parity of Iπ=29/2+. The half-life of the 29/2+ isomeric state was determined to be 1.49(1)μs. It decays via the emission of 457-keV E2 and 236-keV E1 transitions, respectively. A low-energy 46-keV E2 transition has been identified to depopulate the (29/2−) isomeric state, with a measured half-life of T1/2=614(5)ns. This transition allows the excitation energy of the isomeric state to be determined as 2381 keV. The feeding patterns of both 29/2+ and (29/2−)
isomeric states have also been described. This is the first time
collective structures have also been observed up to high spins and
excitation energies in the neutron-deficient 195Bi nucleus. Evidence for the manifestation of shape coexistence in 195Bi is also discussed.


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Senast uppdaterad 2019-19-08 vid 05:47